Adjustable transition coupler



FIG. 1 is a front perspective view of an adjustable transition coupler showing my new design.

FIG. 2 is a right side view thereof.

FIG. 3 is a left side view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a rear view thereof.

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the drawings illustrate portions of the adjustable transition coupler and form no part of the claimed design. 

CLAIM The ornamental design for an adjustable transition coupler, as shown and described. 